b) Explain the working of a current source inverter fed induction motor drive with necessary
diagrams. (6 marks)

5. a)Explain the operation of a static scherbius drive with neat diagram. Mention its advantages
and disadvantages. (6 marks)

b)With a neat diagram explain the volts, hertz control in induction motor. Mention the
advantages. (6marks)

6. Explain the direct vector control operation of three phase induction motor drive with neat block
diagram. 02 marks)

Part C

7.a) Draw and explain the performance characteristics of synchronous motor drive in constant
torque region and field weakening region. (4 marks)

b) Explain with neat block diagram the operation of a self controlled synchronous motor.
(S marks)
8. Describe with block diagram the closed loop v/f control implementation of synchronous motor
drive. (9marks)
9. a) Explain the speed control of a BLDC motor drives with necessary diagrams and
waveforms.
(6 marks)
b) What are advantages of BLDC motor over conventional DC motor? (3 marks)